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2006 Annual Science Report

University of Washington Reporting  |  JUL 2005 – JUN 2006

Causes of Mass Extinctions: Testing Impact Models

4 Institutions
3 Teams
0 Publications
0 Field Sites
Field Sites

Project Progress

  1. We published a paper in SCIENCE (Strom, Malhotra, Ito, Yoshida, and Kring) that confirms an earlier result (in Journal of Geosphysical Research by Kring and Cohen) that indicates the Earth-Moon system was severely bombarded by asteroids approximately 3.9 billion years ago, which may have affected the origin and early evolution of life on Earth.
  2. We submitted an invited review (to Palaeogeography, Palaeoclimatology, and Palaeoecology by Kring) of the Cretaceous-Tertiary mass extinction event.
  3. We reexamined P/T boundary samples and were unable to find any evidence of impact ejecta.
  4. We are preparing a paper with a complete summary of our analyses of the Triassic-Jurassic mass extinction event in the Queen Charlotte Islands, Canada.
  5. We discovered impact ejecta in Michigan from the 1.85 billion year old Sudbury impact crater. We will be reporting a description of those impact ejecta deposits in August, 2006. These deposits will allow us to examine the effects of a Chicxulub-size impact event on a microbial world.
    David Kring David Kring
    Project Investigator
    Peter Ward

    Lynnette Kleinssasser
    Graduate Student

    Objective 1.1
    Models of formation and evolution of habitable planets

    Objective 4.3
    Effects of extraterrestrial events upon the biosphere